Python 3.8 test failures: ast.Constant

[hroncok]

$ tox -e py38-pytest41
GLOB sdist-make: .../pytest-testmon/setup.py
py38-pytest41 inst-nodeps: .../pytest-testmon/.tox/.tmp/package/1/pytest-testmon-0.9.15.zip
py38-pytest41 installed: atomicwrites==1.3.0,attrs==19.1.0,coverage==4.5.3,coverage-pth==0.0.2,more-itertools==7.0.0,pluggy==0.9.0,py==1.8.0,pytest==4.1.1,pytest-testmon==0.9.15,six==1.12.0
py38-pytest41 run-test-pre: PYTHONHASHSEED='2120733739'
py38-pytest41 runtests: commands[0] | py.test --tb=native test
============================= test session starts ==============================
platform linux -- Python 3.8.0a3, pytest-4.1.1, py-1.8.0, pluggy-0.9.0
cachedir: .tox/py38-pytest41/.pytest_cache
rootdir: .../pytest-testmon, inifile: pytest.ini
plugins: testmon-0.9.15
collected 100 items

test/test_core.py ...........................                            [ 27%]
test/test_process_code.py ......F........................                [ 58%]
test/test_subprocess.py .x.x                                             [ 62%]
test/test_testmon.py .............................x.......s              [100%]

=================================== FAILURES ===================================
______________________ TestReadSrc.test_module_with_1250 _______________________
Traceback (most recent call last):
  File ".../pytest-testmon/test/test_process_code.py", line 53, in test_module_with_1250
    assert "Str('\\xc5\\xa1')" in code_repr or "Str('š')" in Module(None, 'test/samples/print1250r.py').blocks[
AssertionError: assert ("Str('\\xc5\\xa1')" in "0:Expr(Call(Name('print', Load()), Constant('š', None), ))" or "Str('š')" in "0:Expr(Call(Name('print', Load()), Constant('š', None), ))")
 +  where "0:Expr(Call(Name('print', Load()), Constant('š', None), ))" = 2-2 h: 877007445, n:unknown, repr:0:Expr(Call(Name('print', Load()), Constant('š', None), )).code
========== 1 failed, 95 passed, 1 skipped, 3 xfailed in 7.49 seconds ===========
.../pytest-testmon/.tox/py38-pytest41/lib/python3.8/site-packages/testmon/process_code.py:9: SyntaxWarning: invalid escape sequence \s
  coding_re = re.compile(b'coding[=:]\s*([-\w.]+)')
ERROR: InvocationError for command '.../pytest-testmon/.tox/py38-pytest41/bin/py.test --tb=native test' (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   py38-pytest41: commands failed

This is caused by python/cpython#9445

Class ast.Constant is now used for all constants. Old classes ast.Num, ast.Str, ast.Bytes, ast.NameConstant and ast.Ellipsis are still available, but they will be removed in future Python releases.

[Matlino]

I am not able to reproduce the error. I ran the same command but it was successful. Could you verify the error? On which commit you get this error?

[hroncok]

bcd89a6

[hroncok]

3b68557

$ tox -e py38-pytest41
GLOB sdist-make: .../pytest-testmon/setup.py
py38-pytest41 inst-nodeps: .../pytest-testmon/.tox/.tmp/package/1/pytest-testmon-0.9.16.zip
py38-pytest41 installed: atomicwrites==1.3.0,attrs==19.1.0,coverage==4.5.3,coverage-pth==0.0.2,more-itertools==7.0.0,pluggy==0.11.0,py==1.8.0,pytest==4.1.1,pytest-testmon==0.9.16,six==1.12.0
py38-pytest41 run-test-pre: PYTHONHASHSEED='3286914867'
py38-pytest41 runtests: commands[0] | py.test --tb=native test
============================= test session starts ==============================
platform linux -- Python 3.8.0a4, pytest-4.1.1, py-1.8.0, pluggy-0.11.0
cachedir: .tox/py38-pytest41/.pytest_cache
rootdir: .../pytest-testmon, inifile: pytest.ini
plugins: testmon-0.9.16
collected 101 items

test/test_core.py ...........................                            [ 26%]
test/test_process_code.py ......F........................                [ 57%]
test/test_subprocess.py .x.x                                             [ 61%]
test/test_testmon.py .............................x.......xs             [100%]

=================================== FAILURES ===================================
______________________ TestReadSrc.test_module_with_1250 _______________________
Traceback (most recent call last):
  File ".../pytest-testmon/test/test_process_code.py", line 53, in test_module_with_1250
    assert "Str('\\xc5\\xa1')" in code_repr or "Str('š')" in Module(None, 'test/samples/print1250r.py').blocks[
AssertionError: assert ("Str('\\xc5\\xa1')" in "0:Expr(Call(Name('print', Load()), Constant('š', None), ))" or "Str('š')" in "0:Expr(Call(Name('print', Load()), Constant('š', None), ))")
 +  where "0:Expr(Call(Name('print', Load()), Constant('š', None), ))" = 2-2 h: 877007445, n:unknown, repr:0:Expr(Call(Name('print', Load()), Constant('š', None), )).code
=============================== warnings summary ===============================
.tox/py38-pytest41/lib/python3.8/site-packages/pluggy/hooks.py:130
  .../pytest-testmon/.tox/py38-pytest41/lib/python3.8/site-packages/pluggy/hooks.py:130: DeprecationWarning: Use inspect.signature() instead of inspect.getfullargspec()
    return inspect.getfullargspec(func)
  ...

-- Docs: https://docs.pytest.org/en/latest/warnings.html
==== 1 failed, 95 passed, 1 skipped, 4 xfailed, 71 warnings in 7.44 seconds ====
.../pytest-testmon/.tox/py38-pytest41/lib/python3.8/site-packages/testmon/process_code.py:9: SyntaxWarning: invalid escape sequence \s
  coding_re = re.compile(b'coding[=:]\s*([-\w.]+)')
ERROR: InvocationError for command '.../pytest-testmon/.tox/py38-pytest41/bin/py.test --tb=native test' (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   py38-pytest41: commands failed